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IRU3037ACF Datasheet(PDF) 3 Page - International Rectifier |
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IRU3037ACF Datasheet(HTML) 3 Page - International Rectifier |
3 / 21 page IRU3037/IRU3037A & (PbF) 3 www.irf.com PARAMETER SYM TEST CONDITION MIN TYP MAX UNITS PIN DESCRIPTIONS This pin is connected directly to the output of the switching regulator via resistor divider to provide feedback to the Error amplifier. This pin provides biasing for the internal blocks of the IC as well as power for the low side driver. A minimum of 1 µF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. Output driver for the synchronous power MOSFET. This pin serves as the ground pin and must be connected directly to the ground plane. A high frequency capacitor (0.1 to 1 µF) must be connected from V5 and V12 pins to this pin for noise free operation. Output driver for the high side power MOSFET. Connect a diode, such as BAT54 or 1N4148, from this pin to ground for the application when the inductor current goes negative (Source/ Sink), soft-start at no load and for the fast load transient from full load to no load. This pin is connected to a voltage that must be at least 4V higher than the bus voltage of the switcher (assuming 5V threshold MOSFET) and powers the high side output driver. A minimum of 1 µF, high frequency capacitor must be connected from this pin to ground to provide peak drive current capability. Compensation pin of the error amplifier. An external resistor and capacitor network is typically connected from this pin to ground to provide loop compensation. This pin provides soft-start for the switching regulator. An internal current source charges an external capacitor that is connected from this pin to ground which ramps up the output of the switching regulator, preventing it from overshooting as well as limiting the input current. The converter can be shutdown by pulling this pin below 0.5V. Error Amp Fb Voltage Input Bias Current Fb Voltage Input Bias Current Transconductance Oscillator Frequency Ramp-Amplitude Voltage Output Drivers Rise Time Fall Time Dead Band Time Max Duty Cycle Min Duty Cycle SS=3V, Fb=1V SS=0V, Fb=1V IRU3037 IRU3037A CL=1500pF CL=1500pF Fb=1V, Freq=200KHz Fb=1.5V 410 180 345 1.225 50 85 0 -0.1 -64 600 200 400 1.25 50 50 150 90 0 830 220 440 1.275 100 100 250 95 µA µA µmho KHz V ns ns ns % % PIN# PIN SYMBOL PIN DESCRIPTION 1 2 3 4 5 6 7 8 Fb Vcc LDrv Gnd HDrv Vc Comp SS / SD IFB1 IFB2 gm Freq VRAMP Tr Tf TDB TON TOFF |
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